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Texas Instruments LMQ66430MA5RXBRQ1
- Part No.:
- LMQ66430MA5RXBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTFQFN
- Datasheet:
-
LMQ66430MA5RXBRQ1.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
LMQ66430MA5RXBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering 3A output at fixed 5V, operating from 3.0V to 36V input with 42V transient tolerance. It integrates VIN bypass and CBOOT capacitors, uses peak current mode control, and features 400kHz fixed switching frequency for low-EMI operation in radar ECU and infotainment power rails.
For engineers reviewing the LMQ66430MA5RXBRQ1 datasheet, LMQ66430MA5RXBRQ1 pinout, LMQ66430MA5RXBRQ1 application, or LMQ66430MA5RXBRQ1 equivalent, key selection considerations include its integrated capacitors, ZEN 2 switcher architecture for CISPR 25 Class 5 compliance, 1.5µA no-load quiescent current, enhanced HotRod QFN-14 package with wettable flanks, and functional safety documentation support.
Technical Context
The LMQ66430MA5RXBRQ1 employs peak current mode control with auto-mode frequency foldback, enabling seamless PWM-to-PFM transition and >85% efficiency at 1mA. Its ZEN 2 switcher architecture integrates dual-random spread spectrum (DRSS) and optimized pinout to suppress peak emissions without external filtering.
This device uses an internal LDO to generate VCC, supports precision enable thresholds (VEN-VOUT = 1.23V typ), and implements thermal shutdown at 168°C with 20°C hysteresis. The MODE/SYNC pin enables FPWM/autonomous mode selection or external clock synchronization up to 2.5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current automotive subsystems like radar transceivers without external current boosting. |
| Input Voltage Range | 3.0V to 36V (operating), 42V tolerant - handles cold-crank (3VIN) and load-dump transients in 12V/24V vehicle systems. |
| Output Voltage | Fixed 5V - eliminates external feedback resistors, reducing BOM count and layout sensitivity for stable USB-peripheral or MCU core rail generation. |
| Switching Frequency | Fixed 400kHz - enables use of smaller magnetics than 2.2MHz variants while avoiding AM-band interference. |
| Quiescent Current | 1.5µA at 13.5VIN, no load - meets ultra-low standby power requirements for always-on ADAS modules. |
| Package | RXB (VQFN-FCRLF, 14-pin), 2.6mm × 2.6mm - ultra-compact footprint with wettable flanks for automated optical inspection and reliable solder joints. |
| Integrated Capacitors | Two 22nF VIN bypass + 0.1µF CBOOT - reduces external component count, PCB area, and EMI filter complexity. |
Pinout & Package
RXB package: 14-pin enhanced HotRod™ VQFN-FCRLF, 2.6mm × 2.6mm, with exposed thermal pad (GND/DAP) requiring solder connection to system ground for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / UVLO input | Logic-controlled startup with precision threshold (1.23V typ); connects directly to VIN if remote control not needed; must not float. |
| VIN | Main power input | Supplies switching stage; internally connects two 22nF bypass caps to PGND; requires external high-quality capacitor for optimal transient response. |
| VOUT/FB | Output voltage sense / feedback | Fixed 5V output configuration - connect directly to regulated output node; no external resistor divider required. |
| SW | Switch node | Connects to power inductor; high dv/dt node - demands short, low-inductance routing to minimize ringing and EMI. |
| BOOT | Bootstrap supply | Internally connected 0.1µF cap to SW - supplies gate drive for high-side MOSFET; no external capacitor needed. |
| PG | Open-drain power-good flag | Signals regulation status (104–111% OV, 89–94.2% UV thresholds); enables elimination of external reset supervisor ICs. |
| MODE/SYNC | Mode select / clock sync input | Selects FPWM/autonomous mode or synchronizes to external clock (0.2–2.5MHz); supports noise-sensitive system timing coordination. |
| GND/DAP | Power ground / thermal pad | Exposed thermal pad - must be soldered to PCB ground plane for thermal dissipation (RθJB = 26.2°C/W) and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| ZEN 2 switcher architecture | Combines dual-random spread spectrum (DRSS) and enhanced HotRod QFN to meet CISPR 25 Class 5 EMI limits without common-mode chokes. |
| Integrated capacitors | Eliminates two external 22nF VIN bypass caps and one 0.1µF bootstrap cap - reduces component count, board space, and assembly cost. |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration - includes FMEA guidance, diagnostic coverage analysis, and failure mode reports. |
| Ultra-low quiescent current | 1.5µA no-load IQ enables >10-year battery life in always-on automotive modules powered by backup batteries or supercaps. |
| NC pin isolation | Strategic no-connect pins placed between high-voltage nodes (e.g., VIN–SW, SW–BOOT) to improve pin-level FMEA and prevent creepage-related failures. |
Applications
| Radar ECU Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ASICs requiring clean, stable 5V at up to 3A with minimal EMI coupling into RF front-end. IC Role / Device Role / Timing Role: Primary buck regulator supplying analog/digital cores and PLLs; operates in FPWM mode to avoid frequency modulation artifacts near radar bands. Use Value: Integrated DRSS and HotRod package eliminate need for shielding or ferrite beads - reduces bill-of-materials and improves RF sensitivity margin by >6dB. |
Use Scenario: Generates 5V main logic rail for multimedia SoCs in automotive head units, supporting USB peripherals, display interfaces, and audio codecs. IC Role / Device Role / Timing Role: System power manager with power-good signaling; coordinates with PMIC sequencing and microcontroller boot-up via PG flag. Use Value: Built-in PG with 2.5ms activation delay replaces discrete reset supervisor IC - simplifies power tree and reduces PCB layer count. |
| eCall Module Backup Power | Body Control Module Sensor Interface |
Use Scenario: Provides regulated 5V during vehicle crash events when main battery drops below 6V, sustaining GSM/LTE modem operation from backup capacitor. IC Role / Device Role / Timing Role: Cold-crank capable buck converter - maintains regulation down to 3VIN with 400kHz fixed frequency for predictable transient response. Use Value: Supports 3VIN cold-crank and 42V load dump without external protection - eliminates TVS diodes and overvoltage clamping circuitry. |
Use Scenario: Supplies 5V to LIN transceivers, ambient light sensors, and door module MCUs in body electronics zones with high temperature cycling. IC Role / Device Role / Timing Role: Junction-temp-rated (-40°C to +150°C) power source with NC-pin isolation - ensures reliability in under-hood junction boxes. Use Value: Best-in-class pin FMEA and AEC-Q100 Grade 1 qualification reduce field failure rate in 15-year automotive service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ66430MC5RXBRQ1 | Same 3A/5V rating but fixed 2.2MHz switching frequency - higher frequency enables smaller inductors but increases switching losses at high load. | Better suited for space-constrained layouts where inductor size dominates; less ideal for noise-sensitive RF zones due to AM-band proximity. | Select LMQ66430MC5RXBRQ1 only when board area is critical and EMI filtering can be added; otherwise prefer LMQ66430MA5RXBRQ1 for lower EMI and thermal stress. |
| TPS62933QRVCRQ1 | 3A, 5V fixed, 2.2MHz, but lacks integrated bypass/boot capacitors and DRSS - requires external 22nF VIN caps and more complex EMI mitigation. | Requires additional components and layout effort to meet CISPR 25 Class 5; no ZEN 2 architecture or NC-pin FMEA enhancements. | Choose TPS62933QRVCRQ1 only if existing design already uses TI's 2.2MHz ecosystem and cost-per-component is prioritized over total solution size and qualification depth. |
Compared with LMQ66430MC5RXBRQ1 and TPS62933QRVCRQ1, the LMQ66430MA5RXBRQ1 delivers superior EMI performance with zero external capacitors, lower thermal resistance (RθJB = 26.2°C/W), and automotive-grade pin-level reliability - making it optimal for safety-critical ADAS and infotainment power rails where layout simplicity and long-term field robustness are mandatory.
Availability
LMQ66430MA5RXBRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems, infotainment head units, and body electronics applications requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for LMQ66430MA5RXBRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade power management ICs and functional safety solutions.
The LMQ664x0-Q1 product line was designed specifically for ultra-compact, low-EMI, always-on automotive power rails - targeting radar ECUs, digital clusters, and eCall modules where board space, thermal performance, and CISPR 25 compliance are non-negotiable.
FAQ
What is the maximum input voltage the LMQ66430MA5RXBRQ1 can withstand during automotive load dump events?
The LMQ66430MA5RXBRQ1 supports 42V transient input voltage per AEC-Q100 requirements, enabling direct connection to 12V/24V vehicle batteries without external overvoltage protection. This rating applies to short-duration load dump pulses defined in ISO 7637-2 Pulse 5a, and the device maintains regulation throughout the event when properly decoupled with recommended input capacitance.
Does the LMQ66430MA5RXBRQ1 require external input or bootstrap capacitors?
No - the LMQ66430MA5RXBRQ1 integrates two 22nF VIN bypass capacitors and a 0.1µF bootstrap capacitor internally. These eliminate the need for external high-frequency ceramic capacitors on the VIN and BOOT pins, reducing component count, PCB area, and EMI filter complexity while maintaining robust start-up and switching performance.
How does the MODE/SYNC pin function on the LMQ66430MA5RXBRQ1?
The MODE/SYNC pin on the LMQ66430MA5RXBRQ1 supports three configurations: pull-down for Auto mode (PFM/PWM transition), pull-up for FPWM mode (fixed 400kHz), or AC-coupled external clock input (0.2–2.5MHz) for synchronization. It uses an internal PLL to lock phase without glitches, preserving regulation integrity during frequency transitions.
What is the thermal performance of the LMQ66430MA5RXBRQ1 in a typical 4-layer PCB layout?
In a standard 4-layer JEDEC board, the LMQ66430MA5RXBRQ1 achieves RθJB = 26.2°C/W (junction-to-board) and RθJA = 66.1°C/W (junction-to-ambient). With proper thermal pad soldering to a solid ground plane, it sustains 3A continuous output at +125°C ambient without derating - validated per AEC-Q100 thermal test conditions.
Is functional safety documentation available for the LMQ66430MA5RXBRQ1?
Yes - Texas Instruments provides functional safety documentation for the LMQ66430MA5RXBRQ1, including FMEDA reports, safety analysis summaries, and diagnostic coverage data aligned with ISO 26262 ASIL-B requirements. This enables system-level safety case development for automotive ADAS and powertrain applications.
LMQ66430MA5RXBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN (2.6x2.6)
LMQ66430MA5RXBRQ1 FAQ
1.How can I place an order for LMQ66430MA5RXBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ66430MA5RXBRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMQ66430MA5RXBRQ1 reliable?
The price and inventory of LMQ66430MA5RXBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ66430MA5RXBRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ66430MA5RXBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ66430MA5RXBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ66430MA5RXBRQ1?
LMQ66430MA5RXBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ66430MA5RXBRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMQ66430MA5RXBRQ1?
For technical support, including LMQ66430MA5RXBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ66430MA5RXBRQ1 requirements.
6.How does Aetrix verify that LMQ66430MA5RXBRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ66430MA5RXBRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMQ66430MA5RXBRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ66430MA5RXBRQ1?
All LMQ66430MA5RXBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ66430MA5RXBRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMQ66430MA5RXBRQ1 part is unused and in its original packaging.
Return procedure for LMQ66430MA5RXBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ66430MA5RXBRQ1 Tags
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